the photo that explains almost everything (updated!)

You've seen photos like this. A large group of people, with images comparing the amount of precious urban space they take depending on the mode of transport they use.  This new one is by Australia's Cycling Promotion Fund.

CanberraTransportPhoto_x3_3600px

This photo makes at least three important points, two of them probably not intended.  In this one image you can see that:

  • Bike racks on buses (and most other transit) can never be more than a niche market

The rack on the bus in pic #1 carries two bikes, which is great for those two people.  But if all the bikes in pic #2 try to get onto the bus in pic #1, we have a geometric impossibility.  Bike racks are already as large as they can be if the driver is still to be far enough forward to drive safely.  A non-folding bike inside a transit vehicle takes the space of several passengers, so could fairly be accommodated only at several times the fare.  In the ideal sustainable future, you will have to park your bike at the station, or return your rental bike, just as Europeans do.  If transit does accommodate your bike, you really should pay a fare premium that reflects the rough number of passenger spaces displaced, or the supply/demand ratio for 2-3 bike racks vs 20 people wanting to use them.

 Dreamers along these lines may well be right about many suburban areas, where demand is sparse and the land use pattern precludes efficient transit.  But when all the people in this picture want to travel, driverless cars may take less space than the cars shown here, but they will still take far more space than a bus would.  The scarcity of space per person is part of the very definition of a city, as distinct from suburbia or rural area, so the efficiency with which transport options use that space will always be the paramount issue.  

(Of course, this very thought experiment presumes that we will actually achieve, and culturally accept, driverless cars that require very little space between them, in which the prevention of ghastly accidents — especially with pedestrians and bikes who may appear with zero warning and minimal stopping distance — is achieved through the absolute infallibility of human-designed hardware and software.)

To make the same point more generally:

  • In cities, urban space is the ultimate currency.  

We spend too much time talking about what things cost in dollars and not enough about what they cost in space.  That, of course, is because urban space is perversely priced to encourage inefficient uses of it and discourage efficient ones.  If you're going to claim to be able to visualize how technology will change the world of 2040 — as the techno-futurists claim to do — you should also visualize what a political system ruled by people now under 40 would look like.  These people are much less emotionally attached to cars, care about environmental outcomes much more, and value urban space much more than their parents do.  Given that the revolution in urban pricing has already begun (see the London and Singapore congestion charges, and the San Francisco and Auckland dynamic parking systems), isn't it foolish to assume that today's assumptions about how we apportion urban space will still rule your techno-utopia?

UPDATE:  A reader points out one other key point, which is that

  • the photo understates the space requirements of bikes compared to the other two.  

Once you put these three systems in motion, the cars and bus will need more space in one dimension — forward and back.  However, in motion, the mass of bikes will expand in two dimensions, it will need to be both longer and wider for all the bikes to move safely.  This could have been rectified in the photo by consciously spacing the bikes to a distance where riders would feel comfortable at a brisk cycling speed that ensures not only stopping distance but also space for passing.  Masses of cyclists on a recreational ride may all agree to ride in tight formation at the same speed, but in daily life cycling infrastructure must accommodate the the fact that people in a cycling crowd will have different desires and intentions around speed, which affects lateral spacing and stopping distance.

43 Responses to the photo that explains almost everything (updated!)

  1. ant6n September 21, 2012 at 3:39 pm #

    Two points:
    a) First, any transit vehicle that has high infrastructure cost relative to operations can transport bicycles very well – you just have to require that bicycles are transported outside of rush hour, when the train capacity is needed. At other times, it is easy and relatively cheap to provide surplus capacity providing the extra space. That is how Montreal does it.
    In Germany, bicycles are brought on the transit vehicle, but there are extra tickets that people have to get, that are around a third to half of an adult fare. Note that cost does not necessarily raise linearly with used space.
    b) Buses are close to never full. The average occupancy of buses in North America is low. If everybody only used buses to transport themselves, cities would probably feel very deserted. Note also that the average occupancy of cars is like 1.3 ppl/car, and cars include big cars. If you put 4 people in every car, you just cut congestion by a third. If you put 10 people in a minibus taking the space of two cars, or 6 people in a big van, you cut space utilization by 75%. So I wouldn’t say that small-group based demand responsive transit is a geometrical impossibility in a dense urban environment, if it’s not geometrically impossible to have 50% of the population drive at 1.3 ppl/car occupancy.

    • James July 6, 2016 at 10:15 am #

      Your last point about bikes taking more room while traveling would apply to the cars too, and in a much more drastic sense. So the image is completely fair.

  2. Jack Horner September 21, 2012 at 5:43 pm #

    Jarrett: Bike racks on buses (and most other transit) can never be more than a niche market.
    Coincidentally, in the city of the photos (Canberra, Australia) I recently attended a pre-election ‘meet the candidates’ function organised by a bicycle group.
    All candidates apparently regarded bikes on buses as a motherhood issue. The present minister sounded apologetic because only three quarters of buses are fitted at present.
    I agree that in a mass transit setting bike cages at stops are the way to go. Do the sums: apart from the onboard space, think of the minute or two extra dwell time to hook and unhook a bike delaying 50 other people already on board.
    Certainly the issues may be different in low density suburbia where buses are usually almost empty anyway so –
    – the space is not a problem;
    – not many other riders are being delayed.
    A possible compromise to enlarge the mobility of a certain minority without too much delay would be bikes on trunk routes, on selected trips (meaning of course that the fitted buses would have to be scheduled reliability and advertised).

  3. asdf September 21, 2012 at 6:47 pm #

    Where I live, we have a lot of express bus routes that travel on freeways with long distances between stops. At the suburbia stops, the quality of connecting buses is often sub-par and some areas has no connections whatsoever on Sundays.
    This is fine for people who live in the suburbs and drive their car to the bus stop to visit the city, but for people who live in the city that are visiting the suburbs, carrying a bike on board the bus is really the only way to make the system usable, short of calling a friend or the local taxi company and asking them to pick you up at the park and ride.
    I believe the solution here is to carry a human-powered vehicle on board the bus, but something that is small enough to be brought on board, like a folding bike, skateboard, or kick scooter.

  4. Joel N. Weber II September 21, 2012 at 8:21 pm #

    There are plenty of urban settings where the headways of 40′ buses are an awful lot less than once per minute; a substantial fraction of MBTA bus routes in the greater Boston, MA, USA area have headways less frequent than every 5 minutes even at peak times, and in such places, replacing the 40′ buses with lower density, more frequent service ought to be a win.
    (That said, I don’t expect we’ll ever see something like Personal Rapid Transit in the SL1/SL2 tunnel, for precisely the geometric reasons being discussed.)

  5. Brent September 21, 2012 at 8:43 pm #

    The flip side to the second point is that the difference in space requirements is much more substantial if you assume that the vehicles are actually moving. (And this applies not just to the cars, but for the bikes as well, which are bunched together like they’re competing in the Tour de France.) Not to mention the additional time to get 40 cars through an intersection vs. one bus.

    • Stephanie February 19, 2016 at 7:03 am #

      If you are trying to make the point the cyclists would take up far more space than the illustration depicts based on the number in the group you are missing the point of the picture. Certainly it would be very rare if ever during a normal day when people are cycling as transportation that you would have such a large group of cyclists congregated at any point on a roadway at one time.

  6. Bradley Wentworth September 21, 2012 at 9:22 pm #

    OK, I’d like to debunk a myth that keeps cropping up here and elsewhere about bike racks on local buses: their value lies less in being part of a multi-modal trip and more in being there ‘just in case’. A helpful analogy might be the taxi system; when you don’t have a car or your car is out of commission or you need to make an important one-way trip, you call a cab. Critiquing the use of taxi-cabs because there aren’t enough for everyone (or as in the picture, enough for the peak transit demand on a route) is similarly silly.
    I cycle everywhere, and only use the bike racks occasionally, like when I get a flat tire and don’t have time to fix it, or when a more serious mechanical issue crops up. Bike racks on buses extend your freedom: you can bike with fewer tools, without rain gear, or even without a lock if you can take your bike inside your destination. If something untoward happens you put your bike on the front of the bus and finish your trip. This happens to me once every couple of months.
    At the core of the misunderstanding is that for local bus trips, a cycling trip is about as fast, especially if you compare the two modes in door-to-door time and not just average speed in traffic. People won’t choose to use the bike racks because they can just bike to their destination and save a transit fare. But I wouldn’t call them a “niche market”: I think they’re essential like good bike parking and bike lanes.
    Note that this argument is even more important for people who point at the empty bike racks and say “look, what a waste!” What they don’t realize is that the mere presence of bike racks encourages cycling.

  7. EngineerScotty September 22, 2012 at 9:34 am #

    Buses are close to never full.
    You’re joking, right?
    Certainly, I can’t think of any bus line where the average utilization is 100%, other than perhaps a few peak-only routes. Bus lines that run late at night will have empty seats. And yes, many “coverage” routes through car-centric suburbs are largely empty during peak hours.
    But there are many, many, many, many many examples of bus lines ’round the world that are SRO during peak hours, which regularly skip waiting passengers because there is nor more room. And in many cases, the headways are so low that adding more busses won’t solve the problem without major infrastructure improvements.
    And for planning purposes, it’s peak hour that needs to be designed for and accommodated. Fitting people and stuff on an empty bus is, in general, not a problem.

  8. Sean Nelson September 22, 2012 at 2:22 pm #

    I’d like to second Bradley Wentworth’s remarks. I’ve made many, many bike trips where I knew I had the potential to use the bus if the weather turned horrid or if I ran out of steam, etc. But I’ve only ever actually put my bike on the bus once when I had a flat.
    Bike racks on buses are an important way to facilitate cycling. They’re less about actual transit use and more about encouraging alternate modes of travel. This sort of thing is very difficult to quantify, but there’s absolutely no doubt in my mind that it’s a very real effect.

  9. Alexis September 22, 2012 at 4:44 pm #

    In addition to Bradley’s comments and asdf’s notes about express/suburban routes, I’d like to add that bike racks on transit may be a niche market but they are a very useful and important element of a multimodal system for those who need them. Not everyone has typical transit needs — wheelchairs on buses are also a niche market, in a sense , but vital to those people. Also, since we allow people to bring all kinds of cargo and strollers on for free, it doesn’t seem fair to charge per passenger space used for bikes but not for other items. (Nominal additional charges seem less problematic.)
    Also, I hope I’m accurately imagining that you were wryly quirking your lips while writing the line about the absolute infallibility of human-designed software.

  10. Fred September 23, 2012 at 2:48 am #

    Where I come from we used to hang prams (baby carriages) on the back of buses – in fact the driver got out and helped women hook them on. That was a long time ago, of course…
    However one point about the image at the top of the article – like a lot of the bike lobby “information” peddled around, there is a fundamental dishonesty in the presentation. As pointed out by an earlier poster, those bikes are bunched so close together they couldn’t actually move. If they were spaced out in a realistic way, I suspect they would take up nearly as much space as the cars.

  11. Eric2 September 23, 2012 at 8:06 am #

    Not everyone has typical transit needs — wheelchairs on buses are also a niche market, in a sense , but vital to those people.
    Wheelchair users are incapable of getting around any other way, and we view getting around as a basic human right. In contrast, if there is no bicycle infrastructure, bicycle users can always get around the same way as everyone else.
    If they were spaced out in a realistic way, I suspect they would take up nearly as much space as the cars.
    If the cars were spaced out in a realistic way, they would take up much more room also. Anyway, bicycles are preferable to cars in terms of collision danger, pollution, public health, noise, and so on. For those reasons I’d rather have bicycles than cars on my street, even if they took up the same space.

  12. Eric2 September 23, 2012 at 8:10 am #

    Where I come from we used to hang prams (baby carriages) on the back of buses – in fact the driver got out and helped women hook them on.
    Which REALLY slows the route down, and possibly costs the transit agency more money than the pram’s space on the bus is worth.
    In my city (currently), parents with prams get on the back door so there is no delay whatsoever. They then come to the front to pay.

    • Stephanie February 19, 2016 at 6:59 am #

      You are totally missing the point, even though you then go on to support it, which is simply that accommodating bicycles, wheelchairs or prams allows greater transportation options and increases the likelihood someone will want to and can use the bus.

  13. Neil September 23, 2012 at 10:45 am #

    Bike racks are a niche market, but do allow a certain amount of service extension at very low cost. I know a couple of people who use racks-on-buses frequently, as there is no bus service to their place of employment. While there is bus service to their homes, having access to a bike at both ends of the trip shortens the total trip time by about 15 minutes.
    So for locations where it’s uneconomical to provide bus service (or at least frequent bus service), the small number of people able to make that additional connection using a bike is a great option, and racks are much cheaper than setting up a Velib/Bixi/Borris Bike type system for a small number of users.
    It is a niche market, though.

  14. dejv September 23, 2012 at 11:15 am #

    I absolutely love one thing in the new picture: the position and angle of camera is absolutely the same for all three photos. That wasn’t the case in the old photo.

  15. Joseph Alacchi September 23, 2012 at 12:01 pm #

    I believe there is definite value in bike racks on any bus route that travels at a speed faster than biking speed, so faster than say 18kph point-to-point distance.
    In practice, this limits to the usefulness of bike racks to suburban routes and possibly urban express buses running on major freeways or arterials.
    However, I believe that they form an integral part of a complete transit solution. By combining bike and bus in a suburban context, the travel time savings can be immense and time-competitiveness with respect to driving can increase to the point that (given the cost savings), public transit can actually become a logical choice even for “choice riders” on routes where that otherwise would be impossible.
    Issues like long walks to/from stops because of low density: GONE. Issues caused by poor connection times: MOSTLY GONE (by biking one of the legs instead of using the bus).
    Now, while it’s clear that there is a capacity limitation there, in practice, in 3 years, I’ve been rejected from a bus once due to the racks already being in use. I find that automatically (culture, call it what you want), only maybe 20% of people will even consider the bike-bus combo, and that’s only if it suits the trip being taken, so overuse really isn’t an issue, at least not at my agency CIT Laurentides in the northern suburbs of Montreal.
    So far, no urban buses and few suburban buses in Montreal offer this service, but in the US this service seems to be the norm among many urban agencies. Are you really telling me that these racks are used enough to warrant the levy of an extra fare or to cause major inconveniences to users? I somehow doubt that is the case!

  16. Joel N. Weber II September 23, 2012 at 6:32 pm #

    The Boston Harbor crossings in Massachusetts, USA, are in interesting case, in that the Ted Williams Tunnel and Callahan and Sumner Tunnels permit automobile traffic but not pedestrians or bikes. (The Ted Williams tunnel does carry the SL1 bus.) I believe the Tobin Bridge also prohibits pedestrian and bicycle traffic, while carrying at least one bus route. And the Blue Line subway tunnel is not far from the Callanhan and Sumner Tunnels.
    http://www.mbta.com/riding_the_t/bikes/ indicates that the Red Line and Orange Line prohibit non-folding bikes for three hours in the morning and three hours in the evening; on the Blue Line, precisely where there is no reasonably direct legal bicycle route, the restrictions are two hours a day inbound in the morning peak, and two hours a day outbound in the afternoon peak. (One could still wonder whether allowing single occupancy automobile traffic but not bicycle traffic during those two hours of each commute period makes sense.)

  17. Nikko P September 23, 2012 at 7:58 pm #

    Fred, the cars aren’t exactly spread out either. They’re parked pretty compactly.

  18. EngineerScotty September 23, 2012 at 10:47 pm #

    Transit serves many niche markets. And given the network effects of transportation infrastructure, service to many niche markets is how one builds a transportation system.
    After all, in a network with dozens of line, the riders whose homes/destinations lie along a particular bus line, could be considered a “niche market” by virtue of that fact. Chances are, service to each of these niche markets costs the agency money.
    But the total of all of these niche markets, is way bigger than the sum of all the parts.

  19. Step-Through September 24, 2012 at 6:55 am #

    Bike share. Having bikes available at major transit stops is the best way to integrate bikes and transit for last-mile mobility.
    Of course, it all depends on context. In dense areas, the bus is more of a circulator and if you have a bicycle with you, it will almost always be faster and easier to just pedal to your destination. If you have a multi-centric region, you can have bike share stations available, as I said, at major hubs and stations. On the other hand, if you have a completely decentralized metro, then many people would need their own bike at both ends of their trip and boardings will be spread out along bus routes, so there are no really efficient solutions.
    Caveat: when I was pregnant, I took my bike on the train a lot (MARTA, here in Atlanta) because I tired easily. And many years ago, when I used to reverse-commute to the suburbs, I took my bike on the bus daily. One day when they upgraded to big new express coaches, they didn’t have the bike racks installed yet. I ended up putting my bike in the luggage compartment under the bus. The next day, they had the rack mounted. 🙂

  20. Jeffrey Jakucyk September 24, 2012 at 8:12 am #

    Bike racks on buses are nice to have when they’re not used much, but they easily become victims of their own success. In a place with lots of people biking, the racks will quickly become overwhelmed. This leads to excess delays as more people are stalling the bus taking their bike on and off, and by making people who want to take their bike on the bus wait for the next one (or the one after that, or the one after that) with an empty space on the rack. This is why you don’t see bike racks on buses in many European countries, especially the ones with strong bike mode shares.
    What’s the alternative? Space for bikes inside the vehicle is one. That may mean longer vehicles, but when you have a more hierarchical transit network that adds streetcars, light rail, commuter rail, subways, etc., then they can devote a large portion of one of the cars to holding bikes, which is easier than on a bus. For things like day-to-day commuting, they just leave their bike at the station which has protected racks or bike lockers. For someone who needs a bike on both ends of the transit ride, they have two bikes that they leave at each end so they don’t have to worry about cramming it onto the transit vehicle somehow.

  21. TransitPlannerMunich September 24, 2012 at 11:14 am #

    There is also something similar for the tram:
    When in Heidelberg, Germany the tram tracks in one street were renewed, a local citizens association for this district used the opportunity to demonstrate how much space cars would need if they would replace the tram.
    They took a tram with 40 meters length and space for 230 passengers. For the photo they estimated 50% of the space would be taken (115 passengers). If they would travel by car 100 cars would be needed.
    Also it was calculated that during rush hour one tram of 40 meters would replace over 150 cars, and that those cars travelling would take street space of 3 km length. So 3 km cars vs. 40 meters tram…
    After this practical demonstration the citizens of course made a party, photos of that are also included…
    http://www.tiefburg.de/aktion_gegen_stau.htm

  22. Scott September 24, 2012 at 11:41 am #

    “Masses of cyclists on a recreational ride may all agree to ride in tight formation at the same speed, but in daily life cycling infrastructure must accommodate the the fact that people in a cycling crowd will have different desires and intentions around speed, which affects lateral spacing and stopping distance.”
    Well, to a degree but not as much as you might think, at least in my experiences as an electric-bicycle commuter in China. (Of course, the same goes for buses and trains; far more people can get on Russian, Japanese or Chinese mass transit than ‘Merican or Canadian because they will actually move together and even – shocking! – touch each other.) In a true bicycling crowd, just like in heavy driving traffic, most people – with exceptions – tend to move along together at a reasonable speed instead of riding like individualistic maniacs.
    http://www.brainsofchina.com/images/Chinese%20crowd%20on%20bikes.jpg
    http://www.welcome-to-my-copenhagen.com/images/copenhagen_bike_head.jpg

  23. Ted Re September 24, 2012 at 1:06 pm #

    After experiencing bike racks in San Francisco, they are invaluable for odd trips. They make living the car free dream that much more possible. We even used a rack to go on holidays, which was cycling 2 days back to the city. Putting a charge on carrying a bike on transit will discourage cycling. All you need do is ban them on certain peak services, like they do on BART.
    It is frustrating that you note bikes take up much more space. The space between handlebars is very achievable in my opinion. If you only go 2 abreast x 30 long, it will approximate 4 bikes x 15, a longer narrower rectangle of similar area.
    Further, they will be much more compact lengthwise than cars, given their peak speed will be less (mind you their average speed is similar to cars in the inner city).
    At intersections cars can never match bikes for smooth flow.
    http://www.youtube.com/watch?v=0q-ej1eihoU
    Finally there is parking space. In the United States, engineers from UC Berkeley estimate there are “only” about 3 or 4 parking spaces per automobile. That’s 800 million spaces, or about half the size of Massachusetts.
    http://www.scientificamerican.com/podcast/episode.cfm?id=no-such-thing-as-a-free-parking-spo-11-01-09
    And that’s not including the interstates, local roads etc etc just sitting there to service the cars.
    The photo underestimates the space taken by bikes compared with cars?? Come on Jarrett. This is the first time I’ve read in your blog and scratched my head.

  24. Chris M. September 24, 2012 at 2:15 pm #

    So if we were to use one measurement that describes the situation best, it wouldn’t be “space taken up by 40 cars; buses or bicycles” because they all take up a different amount of space when moving at different speeds and the slow ones must stay on the road for longer.
    It would be flow rate controlled for lane width: persons per lane per hour.

  25. Ian J September 24, 2012 at 4:50 pm #

    “It would be flow rate controlled for lane width: persons per lane per hour”
    Flow rates don’t allow for the space vehicles take up when stationary. In this sense I do not think the spacing of the cars and bicycles in the photograph is misleading: in the context of a discussion of congestion, it shows the amount of space queued traffic (on cars or buses or bikes) will take.
    However, it is misleading in a broader sense, in that despite Jarrett’s claim that urban space is the ultimate currency, it is not quite the zero sum game that metaphor implies. In the road illustrated a flow of bicycles can easily share a lane with a flow of cars, so if trying to calculate a flow rate, how many lanes should be attributed to bicycles? Because people on bicycles and on foot are able to use urban space much more efficiently and flexibly than people in vehicles, they can effectively create extra space in cities.

  26. MaxUtil September 24, 2012 at 4:51 pm #

    As at least one other touched on, this is nothing compared to what it would look like if you include parking (at both ends of the trip)!
    I’ll also agree with others that bike racks on buses serve as a good emergency tool or for extra long trips. But they work well only in the context of good general bike infrastructure. I know some people who use them for trips they would do on a bike if distance was the only issue. But for them it is more that they need to go through routes that are perceived as too dangerous to bike. Obviously, this won’t scale well.
    Bikes on rail works significantly better because adding more space a lot more feasible. The most disruptive issue there seems to be more about station entrance and access.

  27. Andre Lot September 24, 2012 at 6:02 pm #

    As with any similar comparisons, the photo op is naive in its purposes to “demonstrate” anything as people on any ROW, regardless of mode, very rarely are travelling all from one place to another (say, within a 300-yard maximum radius).
    Fitting more people in less space is pointless if this “efficiency” gain is negated by so-called last-mile and frequency issues, often discussed here.
    ====================
    Now, in relate to bicycles on transit vehicles, I second those saying that bike racks, or bikes on trains/trams, are only viable as far as biking remains a niche for spandex or “feel-good” riders.
    Let’s take a look on metro areas where bicycles have really widespread use like Rotterdam (Netherlands) – bikes are banned from subways, trams and most buses 24/7 with a few exceptions of especially fit buses. Restrictions apply to folded bikes as well. This is the standard practice for other big Dutch cities. You can take your bike on commuter trains, subject to space availability and a non-trivial surcharge.
    What people do? They park bikes on or near bus stops, train stations and the likes. Many have enclosed lockers for rent on long-term subscription plans.
    So the only reasons bike racks mounted on buses “flourish” in US is because there are few people using bikes first place.

  28. Alon Levy September 24, 2012 at 6:08 pm #

    What Andre said. And on top of that, the more people use bikes, the more impetus there is to provide protected bike parking at the stations.

  29. JJJ September 24, 2012 at 6:36 pm #

    Doesnt change the point, but bus racks for three bikes are common. I believe racks for four exist, havent seen one myself though.

  30. PaulM September 24, 2012 at 9:26 pm #

    I was there when the photo was take and highly support the community effort in getting the alternative transport options out there. Space use is one aspect the picture is making. It is more to make a person realise there are other ways of getting around and you are not limited to one form of transport or even one transport mode for the entire trip.
    I use the bus and often take my bike on the bike rack. 3km ride to bus stop and bus trip to work and 20km ride home. both trips take about the same time. Yes it is a neich market but the more demand the core bus routes have the more it will be upgraded to LRT/BRT with in Cabin hooks on the ceiling. Individual travel options to mix modes can occur. Multimodal travel and different options for travel is the goal.

  31. Kroviniu gabenimas September 25, 2012 at 4:52 am #

    I’d like to second Bradley Wentworth’s remarks. I’ve made many, many bike trips where I knew I had the potential to use the bus if the weather turned horrid or if I ran out of steam, etc.

  32. Ted Re September 25, 2012 at 6:06 am #

    The bikes in the photo appear to take up much *more* space than they really do.
    How much? You might guess they go about halfway towards the road barriers. Look closely – the end of the bikes come in line with the 3rd car. The total length is 15 cars.
    The bikes take up 5% (3/60) of the space of cars. Lets be generous and say that bikes are taking up 1/10th of the space.
    Yes the photo is misleading. Bikes are actually much better than you’d think.

  33. valkraider September 25, 2012 at 3:57 pm #

    Now picture them in front of your house or your child’s school. Which picture is preferable then?
    The second set is likely to be quieter, cleaner, and safer.
    But hey – lets just talk about space.
    Maybe behind them there should be how many barrels of oil they consume and how many tons of CO2 they emit, perhaps in barrels and balloons behind each mode. That would be more representative of the real problem…

  34. Sean Nelson September 26, 2012 at 8:01 am #

    Kroviniu wrote: “I’ve made many, many bike trips where I knew I had the potential to use the bus…”
    This is the point I was trying to make earlier. Bike racks, even though they’re not often in actual use, increase cycling mode share far beyond their own actual capacity and therefore reduce vehicle and transit ridership. That’s a very desirable (albeit quite difficult to measure) outcome.

  35. Danny Howard September 26, 2012 at 2:41 pm #

    At speed, the cars would require even more space to operate safely than would the cars.

  36. Scott October 17, 2012 at 5:28 pm #

    I ride my bike frequently and rarely need to use the bike rack on the bus. I used to alternate riding a bus with biking to the train when I lived in a suburb with good train service. Every time I took the bus I saw the same guy put his bike on the bus rack. He got quick at it so I don’t think that the time spent loading a bike is a problem.
    Not everyone is going to be a biker and I think 2 racks is sufficient for the way people use bikes and buses today. I think the biggest thing holding people back from wider bike usage (besides lack of great bike lanes) is the lack of facilities at destinations like locker rooms.
    I think your argument for a bike share program is pretty good. It is annoying to have to wait 10 mins to transfer to go that last mile. It’s almost a break even with walking at that point and a bike sharing program could be a great way to speed that last mile up as well as save room on transit vehicles for people that are making longer trips.

  37. Michael Andersen March 22, 2015 at 2:21 pm #

    To reiterate two key points covered in the nuanced conversation above about the “true” space efficiency of bikes, raised by Fred and echoed by Jarrett:
    1) If the cars in this photo are going to move, they too are going to need a lot more space on the road – more or less proportional to their speed, assuming human drivers. The greater the speed benefits of cars vs. bikes, the greater the space advantage of bikes becomes. (Same with the bus, for that matter.)
    2) There are three basic uses of space at play in traffic: continuous flow; being stopped at/accelerating out of a red light; and while parked. Bikes stack at something like the pictured density in the second and third scenarios, though not in the first.
    And to add what I think is a new point here:
    3) When it comes to signalized urban grid areas, most of the congestion comes not from the lane capacity in continuous flow but in the capacity of each traffic signal phase, which is in turn dependent on intersection density. So of the three scenarios in point (2) the second one is arguably the single most relevant to congestion conversations.

  38. TomTurner18 November 28, 2015 at 10:22 pm #

    The photographs are attractive but they need scientific road-testing. London has many bus-lanes with good enforcement by a system of cameras and fines. Oxford Street traffic is bus and taxi only and has 160 buses/hour in each direction. The average occupancy is only 18 passengers and the buses only travel at walking speed. Mostly, the buses are bunched and there are long stretches of empty road between the bunches. On the main roads into London there is less bunching and there are far longer gaps, of empty road, between the buses. So my guess is that a ‘crocodile’ flow of bicycles, of the kind you see in Copenhagen and Amsterdam, would transport far more passengers in the same road space (and with less noise, pollution, cost, obesity etc). Does anyone know if passenger flow in dedicated bus and cycle lanes has been empirically tested?

  39. ararar January 14, 2016 at 9:29 am #

    I’ve never seen bike racks on buses here in Europe and you generally can transport bicycles only on traditional trains, but not during rush hour on the S-trains.

    I guess that they’re a nice to have, but not worth the investment to systematically introduce them in new places imho, considering increased dwell times and that they’re destined to be victims of their own success if used to promote last mile bicycle mobility.

    In areas where people ride bicycles for leisure where there are no trains and just one main bus line, like certain valleys, they could be useful though, as non-lycra tourists get tired.

    By the way, are the suburbs and cities so crime-filled that you can’t leave your bike parked, properly locked, at a classic bike rack or locked to a fence or anything?
    I’m currently in a big city known for bike theft, microcriminality and lack of control of who’s who and yet I see a bunch of carelessly locked bicycles every day, so bike theft probably isn’t as big a problem as it sounds it is.

    Long-term solution:
    1. bike share stations close to stops or important places in the dense areas of sufficiently big cities. I’ve seen it work, people really do use it.
    2. rental bicycle lockers or bigger bike stations at the main stops everywhere else, so that people can leave the bike overnight on the other end of their commute.

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